I have the same gun as you, Classic. I put this fall a Leupold 3x9x33 on it and it is more fun to shoot now that I can hit something. When I bought it, I had every intention of keeping it iron sights as I really don't have anything with iron sights. I had a hard time adjusting to the colors on the sights.
I used Burris Signature Zee rings, the ones with the plastic inserts. I swear by them. They are the medium height ones as I don't recall they make a low in that style.
Good Luck,
SteveG